Chemical Thermodynamics Question 154
Question: The free energy change for the following reactions are given below, $ C_2H_2(g)+\frac{5}{2}O_2(g),\to $
$ 2CO_2(g)+H_2O(l);,\Delta G^{o}=-1234,kJ $
$ C(s)+O_2(g),\to CO_2(g)\Delta G^{o}=-394,kJ $
$ H_2(g)+\frac{1}{2}O_2(g),\to ,H_2O(l),\Delta G^{o}=-237kJ $ What is the standard free energy change for the reaction $ H_2(g)+2,C,(s)\to C_2H_2(g) $ [Kerala (Med.) 2002]
Options:
A) - 209 kJ
B) - 2259 kJ
C) + 2259 kJ
D) 209 kJ
Show Answer
Answer:
Correct Answer: D
Solution:
By 2× (ii) - (i) - (iii) $ {H_{2(g)}}+2{C_{(s)}}\to C_2{H_{2(g)}},,\Delta {{G}^{\circ }}=209,kJ $ .
